Two things to keep in mind with RHEL (which is what I'm assuming you mean by "red hat"):
1) It's an Enterprise platform, which means they intentionally try to keep things as similar as possible for as long as possible. The updates you're getting are to fix issues with the older kernel. Occasionally they'll backport new features or rebase a package but the goal is to change as little as humanly possible. This is why they had to create thing like software collections. People kept complaining that the software versions on RHEL were getting very old by the time a platform was halfway through its lifecycle.
2) You're allowed more than one kernel to be installed, for the exact reason you're worried about the update. The default is to keep the current kernel and the two previous kernel installed and available as alternative boot options. If the new kernel creates issues for you, just force a reboot and select one of the older kernels next time. Once you figure out what the issue was with the new kernel (hardly ever happens to begin with, but it's usually some proprietary software being in the initrd) you can remediate and reboot as appropriate.